Hamidur Rahman was born on 2 February 1953 in Khardo Khalishpur village under Moheshpur police station of the Jhenaidah district, and was the eldest son of his family. During the Partition of India in 1947, his paternal properties fell in India. They crossed over the border and settled in the bordering area of Khorda Khalishpur of Jhenaidah district.
He joined East Bengal Regiment on 2 February 1971 and participated in the 1971 Bangladesh Liberation War. During the war he made a significant contribution in capturing the Dhalai Border Outpost at Srimangal. Though the independence fighters came very close to the Border Outpost, it became very difficult to capture owing to the enemy machine gun which was continuously firing from the south-western corner of the Dhalai Border Outpost. On 28 October 1971, a battle was taking place between 1st East Bengal Regiment and 30 A Frontier Force Regiment in Dhalai of Sylhet. 125 members of the East Bengal Regiment decided to use grenades on the machine gun posts of the Pakistani army. Rahman took the responsibility of throwing grenades, and crawled through the hilly canals. He managed to throw two grenades before he was shot. Hamidur Rahman jumped into the enemy machine gun post and engaged in hand to hand fighting with the two crews who were guarding the gun, and at one point neutralized the gun. Realizing the fact that the machine gun outpost was damaged, the EBR's approach towards the enemy captured their first line within a short period of time. After the capture of the Dhalai Border Outpost, members of the EBR found the dead body of Rahman. Sepoy Hamidur Rahman's efforts helped the East Bengal Regiment take the outpost. He was buried in Tripura in India. On 27 October 2007, advisers of the Bangladeshi caretaker government decided to bring back his remains to Bangladesh and bury him besides Bir Shrestho Matiur Rahman. It is said[by whom?] that the last place he stood alive was about 20 feet away from the Pakistani bunker, either in a canal or where the memorial is (near the bunker). 10 December 2007 the remains of Hamidur Rahman were bought back to Bangladesh and on 11 December 2007 he was buried again at Buddhijibi Koborsthan (Cemetery), Dhaka.
For the courage, valour, dedication to the cause of his motherland and supreme sacrifice, he was conferred Bir Sreshtho by the nation of Bangladesh.